Firmware info leak on SIMATIC CN 4100 (<4.0.1)
CVE-2025-40938 Published on December 9, 2025
A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1). The affected device stores sensitive information in the firmware. This could allow an attacker to access and misuse this information, potentially impacting the devices confidentiality, integrity, and availability.
Weakness Type
Use of Hard-coded Credentials
The software contains hard-coded credentials, such as a password or cryptographic key, which it uses for its own inbound authentication, outbound communication to external components, or encryption of internal data.
Products Associated with CVE-2025-40938
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Affected Versions
Siemens SIMATIC CN 4100:- Before V4.0.1 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.